iMac stuck at startup lodading screen

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Level 1

8 points

iMac stuck at startup lodading screen

My iMac 27" late 2012 cannot boot up recently. It stuck at the startup loading screen. The progress bar reaches about 60-70% and stops there for ever. I tried to boot into safe mode and recovery mode and got the same result. The network recovery mode loads something then stuck at the progress bar again. I also tried to reset SMC and Pram with no luck.

I got dual boot on the iMac. So, I tried to boot into Windows 10 as well. But got a black screen after the windows startup screen.

Basically, none of the boot options work.

BTW, I also tried to take out the memory sticks and put different ones back on different slots. It made no difference.

Did anyone have similar issue before?

iMac 27", macOS 10.14

Posted on Jul 23, 2019 5:57 AM

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Answer 1

macjack

Level 10

111,168 points

Jul 23, 2019 6:01 AM in response to jarlylee

Try Single User Mode (hold command-s keys)

At the prompt, enter this command:

/sbin/fsck -fy

Press the Return key.

This will check your directory and report that it was OK or repaired. Then enter this command to

startup normally:

reboot

Run Apple Diagnostics

Press and hold the d key on startup:

https://support.apple.com/en-us/HT202731

If none of those work make a Genius Bar appointment for a free diagnostic:

Genius Bar Reservation and Apple Support Options - Apple

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Answer 2

macjack

Level 10

111,168 points

Jul 23, 2019 7:14 AM in response to jarlylee

I think it's pretty quick but make an appointment beforehand.

Genius Bar Reservation and Apple Support Options - Apple

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Answer 3

jarlylee Author

Level 1

8 points

Jul 23, 2019 6:59 AM in response to macjack

the single user mode passed the check and shows the volume /dev/sthxxxxx is ok. reboot the machine and stuck at loading screen again.

cannot boot into diagnostics mode. press D at startup and machine shows a blank white screen and stuck there.

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Answer 4

jarlylee Author

Level 1

8 points

Jul 23, 2019 7:02 AM in response to macjack

btw, I tried Apple Diagnostics over the Internet by pressing alt+D. After input my wifi password, I got an error message as below

Error: 0x8000000000000003, Cannot load 'EFI/Drivers/TestSupport.efi'

Status: 0x00000003

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Answer 5

macjack

Level 10

111,168 points

Jul 23, 2019 7:00 AM in response to jarlylee

Better bring it in.

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Answer 6

macjack

Level 10

111,168 points

Jul 23, 2019 7:10 AM in response to jarlylee

I'm finding lots of topics about broken EFI partitions but no real answers. This comes close:

http://osxdaily.com/2016/07/28/fix-broken-efi-partition-mac/

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Answer 7

jarlylee Author

Level 1

8 points

Jul 23, 2019 7:12 AM in response to macjack

Thanks for your help. Do you know how long it takes apple to check my iMac if I bring it in for diagnostics? Will they need to hold it for a couple of hours while I'm waiting? or a few days?

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iMac stuck at startup lodading screen

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